Title 26 — Internal Revenue
- Part 1— Income Taxes
- Part 2— Maritime Construction Reserve Fund
- Part 3— Capital Construction Fund
- Part 4— Temporary Income Tax Regulations Under Section 954 of the Internal Revenue Code
- Part 5— Temporary Income Tax Regulations Under the Revenue Act of 1978
- Part 5c— Temporary Income Tax Regulations Under the Economic Recovery Tax Act of 1981
- Part 5e— Temporary Income Tax Regulations, Travel Expenses of Members of Congress
- Part 5f— Temporary Income Tax Regulations Under the Tax Equity and Fiscal Responsibility Act of 1982
- Part 6a— Temporary Regulations Under Title II of the Omnibus Reconciliation Act of 1980
- Part 7— Temporary Income Tax Regulations Under the Tax Reform Act of 1976
- Part 8— Temporary Income Tax Regulations Under Section 3 of the Act of October 26, 1974 (Pub. L. 93-483)
- Part 9— Temporary Income Tax Regulations Under the Tax Reduction Act of 1975
- Part 11— Temporary Income Tax Regulations Under the Employee Retirement Income Security Act of 1974
- Part 12— Temporary Income Tax Regulations Under the Revenue Act of 1971
- Part 13— Temporary Income Tax Regulations Under the Tax Reform Act of 1969
- Part 15— Temporary Income Tax Regulations Relating to Exploration Expenditures in the Case of Mining
- Part 15a— Temporary Income Tax Regulations Under the Installment Sales Revision Act
- Part 16A— Temporary Income Tax Regulations Relating to the Partial Exclusion for Certain Conservation Cost-Sharing Payments
- Part 18— Temporary Income Tax Regulations Under the Subchapter S Revision Act of 1982
- Part 20— Estate Tax; Estates of Decedents Dying After August 16, 1954
- Part 22— Temporary Estate Tax Regulations Under the Economic Recovery Tax Act of 1981
- Part 25— Gift Tax; Gifts Made After December 31, 1954
- Part 26— Generation-Skipping Transfer Tax Regulations Under the Tax Reform Act of 1986
- Part 28— Imposition of Tax on Gifts and Bequests from Covered Expatriates
- Part 31— Employment Taxes and Collection of Income Tax at Source
- Part 32— Temporary Employment Tax Regulations Under the Act of December 29, 1981 (Pub. L. 97-123)
- Part 35— Employment Tax and Collection of Income Tax at Source Regulations Under the Tax Equity and Fiscal Responsibility Act of 1982
- Part 35a— Temporary Employment Tax Regulations Under the Interest and Dividend Tax Compliance Act of 1983
- Part 36— Contract Coverage of Employees of Foreign Subsidiaries
- Part 40— Excise Tax Procedural Regulations
- Part 41— Excise Tax on Use of Certain Highway Motor Vehicles
- Part 43— Excise Tax on Transportation by Water
- Part 44— Taxes on Wagering; Effective January 1, 1955
- Part 46— Excise Tax on Certain Insurance Policies, Self-Insured Health Plans, and Obligations Not in Registered Form
- Part 47— Designated Drugs Excise Tax Regulations
- Part 48— Manufacturers and Retailers Excise Taxes
- Part 49— Facilities and Services Excise Taxes
- Part 50— Regulations Relating to the Tax Imposed with Respect to Certain Hydraulic Mining
- Part 51— Branded Prescription Drug Fee
- Part 52— Environmental Taxes
- Part 53— Foundation and Similar Excise Taxes
- Part 54— Pension Excise Taxes
- Part 55— Excise Tax on Real Estate Investment Trusts and Regulated Investment Companies
- Part 56— Public Charity Excise Taxes
- Part 57— Health Insurance Providers Fee
- Part 58— Stock Repurchase Excise Tax
- Part 141— Temporary Excise Tax Regulations Under the Employee Retirement Income Security Act of 1974
- Part 143— Temporary Excise Tax Regulations Under the Tax Reform Act of 1969
- Part 145— Temporary Excise Tax Regulations Under the Highway Revenue Act of 1982 (Pub. L. 97-424)
- Part 156— Excise Tax on Greenmail
- Part 157— Excise Tax on Structured Settlement Factoring Transactions
- Part 300— User Fees
- Part 301— Procedure and Administration
- Part 302— Taxes Under the International Claims Settlement Act, as Amended August 9, 1955
- Part 303— Taxes Under the Trading with the Enemy Act
- Part 305— Temporary Procedural and Administrative Tax Regulations Under the Indian Tribal Governmental Tax Status Act of 1982
- Part 400— Temporary Regulations Under the Federal Tax Lien Act of 1966
- Part 403— Disposition of Seized Personal Property
- Part 404— Temporary Regulations on Procedure and Administration Under the Tax Reform Act of 1976
- Part 420— Temporary Regulations on Procedure and Administration Under the Employee Retirement Income Security Act of 1974
- Part 509— Switzerland
- Part 513— Ireland
- Part 514— France
- Part 521— Denmark
- Part 601— Statement of Procedural Rules
- Part 602— OMB Control Numbers Under the Paperwork Reduction Act
- Part 701— Presidential Election Campaign Fund
- Part 702— Presidential Primary Matching Payment Account
- Part 801— Balanced System for Measuring Organizational and Employee Performance Within the Internal Revenue Service